Before the film was released in 2001, posters and ads reflected the rating as R before it was re-edited to dub over the kids using the "f" word. Despite quite a bit of profanity remaining, the film was then released with a PG-13 rating.
There are at least three players on the Kekambas team whose names we never learn, nor do we ever hear them speak. The only ones who speak and have their names mentioned are: Andre Ray Peetes, Miles Pennfield II, Jefferson Albert Tibbs, Kofi and Jarius "G-Baby" Evans, Raymont "Ray-Ray". Bennet, Clarence, and Jamal.
Premiered in the same weekend as The Glass House (2001), also starring Diane Lane. Hardball was number one at the box-office, and The Glass House was number two that weekend.
The professional baseball game Conor takes the kids to was filmed at the now demolished Tiger's Stadium in Detroit. You can tell by the unmistakable Old English "D" on the seats.
"Hard Ball" and "The Glass House" were both released on September 14, 2001, and were the first two major motion pictures to be released after the terrorists attack on September 11, 2001. They both co-starred Diane Lane.
The basketball game between Chicago and Miami being watched from outside the bar is actually the 2000 Continental Basketball Association Finals between the Yakima (Washington) Sun Kings and the La Crosse (Wisconsin) Bobcats held at the Yakima Valley SunDome. Yakima won the game, 109-93, to win their second CBA title.